I wonder can you use an iPhone running Keynote Remote to control Keynote running on an iPad?
Yes...to an extent.....using the iPhone Keynote Remote App to control an iPad Keynote presentation works as long as you have WiFi available. It is supposed to work with a bluetooth connection..but..it will not connect. Other threads have suggested a Rube Goldberg work around using a different app to make the connection and leaving that app running in the background. The work around is so involved that I've never been able to do it, but others have.
It mystifies me why Apple doesn't fix it since it involves two pieces of their hardware, Keynote, and the Keynote remote app and it worked in lower versions of both hardware and software.
Some have asked why it is not such a good plan to use the iPhone (IPod Touch) with the remote app. The way it works you have to continually look down at your iPhone to advance slides. It looks bad and takes your focus (and the viewers) away from the presentation. The audience is not even aware of the use of the Apple (or other) IR remote.
I find Apple's continual discontinuing of both hardware and software functions to be annoying. I'm not against progress, but anyone who thinks iCloud is better than MobileMe at this point in time is on another planet. The removal of optical disks, hard drives, the changes in versions of OS X and iOS that enable and disable functions, the addition and removal of Firewire ports, and IR sensors all contribute to user confusion and Apple fails to make the stuff work.
Pretty soon consumers are going to revolt on the Apple craze when they literally have to buy components to plug into the computer to accomplish their tasks. Anybody who has an Apple ID that is different from the required different ID that they got with MobileMe (that's all MobileMe customers) will have serious problems when they migrate to iCloud because that MobileMe ID is the default. I've spent hours on the phone and in Apple stores trying to use all the e-mail addresses I had in Mobile Me and yet preserve the ability to use the ID I used with iTunes to buy things so I can do all the things that includes. Nobody in Apple can actually fix all my issues at the same time because Apple chose not to allow merging of ID's.
I left Windows to get the simplicity, quality, and interconnectivity of Apple products. That no longer exists with my current family of Apple hardware and software. It's a shame.